动荷载作用下饱和砂土动剪模量试验研究.pdfVIP

第27卷第6期 地 震 工 程 与 工 程 振 动 Vo1．27 No．6 2007年12月 JOURNAL OF EARTHQUAKE ENGINEERING AND ENGINEERING VIBRATION Dec．2o07 文章编号：1000—1301(2007)06．0176—05 动荷载作用下饱和砂土动剪模量试验研究 熊 伟，尚守平，刘方成，王海东 (湖南大学 土木工程学院，湖南长沙410082) 摘要：在50kPa、100kPa和200kPa 3种固结压力下分别对饱和度为95％、92％、88％和83％的土样进 行了循环单剪试验，得到了该土样存4种饱和度、3种固结压力下的最大动剪模量G …以及动剪模量 比G／G 一 归一化曲线。分析得出，同一固结压力下土样的G 和G／G 随着饱和度的增大相对 减小；随着固结压力的增大，两者数值上差异逐渐减小。最后对此种现象进行了讨论并分析了其产生 的原因。 关键词：动剪模量；循环单剪；饱和土；试验研究 中图分类号：TU 411 文献标志码：A Laboratory experimental research on dynamic shear modulus of ． saturated soil subjected to dynamic loading XIONG Wei，SHANG Shouping，LIU Fangcheng，WANG Haidong (Civil Engineering College，Hunan University，Changsha 410082，China) Abstract：The cyclic simple shear tests of the saturated soil with saturation 95％ ．92％．88％ and 83％ were carried out under the consolidation pressure of 50 kPa，100 kPa and 200 kPa，respectively．Of four sorts of soil sample un— der three consolidation pressures，the maximum dynamic shear modulus Gd a and the dynamic modulus ratio ． G／Gd 一 generalized curves were attained and analyzed comparatively．The results show that under the same con． solidation pressure，the values of Gd ，G／Gd shrink according to the growth of saturation；with the increasing of the consolidation pressure，the differences among G 1 and G／Gdn1 一 decrease gradually．In the last part of the pa— per，this kind of phenomenon and its causes are under discussion and analysis． Key words：dynamic shear modulus；cyclic simple shear；saturated soil；laboratory experimental study． 引言 震害经验和土层地震